Carbon­yl–carbonyl, carbon­yl–π and carbon­yl–halogen dipolar inter­actions as the directing motifs of the supra­molecular structure of ethyl 6-chloro-2-oxo-2H-chromene-3-carboxyl­ate and ethyl 6-bromo-2-oxo-2H-chromene-3-carboxyl­ate

Santos-Contreras, R.J.; Martínez-Martínez, F.J.; García-Báez, E.V.; Padilla-Martínez, I.I.; Peraza, A.L.; Höpfl, H.

doi:10.1107/S0108270107008712

Acta Crystallographica Section C
Acta Crystallographica
Section C STRUCTURAL CHEMISTRY

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Figure 3
Layers of centrosymmetric hydrogen-bonded dimers of (I)

, viewed in the ab plane. R₂²(14)[R₂¹(6)] and R₂¹(5) motifs are shown. Some H atoms have been omitted for clarity. [Symmetry codes: (i) −x + 2, −y, −z + 1; (ii) −x, y + $[{1\over 2}]$ , −z + $[{1\over 2}]$ .]

STRUCTURAL
CHEMISTRY

ISSN: 2053-2296

Volume 63| Part 4| April 2007| Pages o239-o242

https://doi.org/10.1107/S0108270107008712

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